Night blindness. List ed in medical dictionaries under "Nyctalopia"
from the Greek "nyct' (night) + "aloas" (obscure or blind) + "opsis" (vision), the
condition involves impaired vision in dim light and in the dark (but normal sight
in bright light), due to impaired function of specific vision cells (the "rods")
in the retina. Day sight (night blindness) is a classic symptom resulting from deficiency
of vitamin A. It was discovered by the English physician William Heberden (1710-1801)
who described other medical disorders of importance including angina pectoris (chest
pain that is often severe and crushing, due to an inadequate supply of oxygen to
the heart muscle) and osteoarthritis of the small joints with nodules (Heberden's
nodes) in and about the last joint of the finger. Day sight (night blindness) is
also called nocturnal amblyopia and nyctanopia.
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